patch for dz.c on DecStation 5000/200

Hi,
I've attached a patch to dz.c from the 2.2.1-dec kernel that
allows the Linux serial console to work on a Decstation 5000/200,
However the lines I have added were taken from further up the serial code
and I am unsure of their correctness, i.e. they work on my decstation, but
might break other peoples,
Now for the rest of the kernel :-)
Dave.
------------ David Airlie, David.Airlie@ul.ie,airlied@skynet --------
Telecommunications Research Centre, ECE Dept, University of Limerick \
http://www.csn.ul.ie/~airlied -- Telecommunications Researcher \
--- TEL: +353-61-202695 -----------------------------------------------